It depends on the class.
Aps characters are very expensive since you HAVE to get atleast x2 int on bracers and x1 int on the chest to get same or higher dps.
Mages are need either chan or tankyness so they're in the eh zone.
Non aps Heavy Armor's are the cheapest, since almost any stat works. They can work with tankyness, str, dex and seekers can work with chan too, if the other stats on the piece are cool too.
Between Demonic and R8, R8 is better. If you meant Dragonic instead of Demonic then R8 is better even with the noobst of stats unless your aps, the reason for this is the enhanced def and atk lvls u get comparing to Drag in the piece combo bonus.
RESUMING: On aps toons u need x2 int bracers and x1 int chest=very expensive
All other classes: R8 is better no matter what.